The late 2005 Power Mac G5 was introduced in October, and discontinued in August the next year. There were three configuration options, one dual core processor at 2.0 GHz, one dual core at 2.3 GHz with model number A1177, and one dual core dual processor (quad core) at 2.5 GHz.

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led lights stay lit on logic board slots 4, 5, 6.

led lights on logic board stay lit when powered on. how do i turn them off? what should i pay attention to in order to fix it?

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@thedon here is the table that explains why and when the lights are on. Compare this to your computer and see what you get.

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Notes for LED Table

Power Mac G5 (Late 2005 Dual 2.0/2.3 GHz) logic boards include LEDs 1–5 and LED 7, but not

LED 6. Power Mac G5 (Late 2005 Quad) logic boards include LEDs 1–7.

CPU A is located closest to the PCI Express slots; CPU B is located below CPU A (closer to the

power supply). Make sure CPU screws are tight.

LEDs 3, 4, and 5 operate differently from the other LEDs. They remain off until you remove

the air deflector (clear door inside the side access panel), at which point they should go

on. If LED 3, 4, or 5 is on before you remove the air deflector, check the operation of the air

deflector sensor. Note that the fans will run at high speed while the air deflector is removed.

LED 5 verifies that Open Firmware has loaded. To allow time for it to load, be sure to wait at

least one minute from first power up before you check this LED.

Some logic boards have two additional LEDs: one located near the bottom edge of the logic

board and the other to the right of the top bank of DIMM slots. These LEDs were used only

during manufacturing and should be ignored.

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